Celsius to Kelvin Conversion
Celsius to Kelvin conversion is used when a temperature needs to be expressed on the absolute temperature scale. Celsius is commonly used for everyday temperatures, while Kelvin is widely used in science, physics, chemistry, and other technical fields.
How to Convert Celsius to Kelvin
The conversion is straightforward. Add 273.15 to the temperature in Celsius.
K = °C + 273.15
For example, to convert 25°C to Kelvin:
25 + 273.15 = 298.15 K
Therefore, 25°C equals 298.15 K.
Why Add 273.15?
The Celsius and Kelvin scales have the same size temperature intervals, but their zero points are different. A temperature of 0°C corresponds to 273.15 K.
Kelvin starts at absolute zero, the lowest theoretically possible temperature. Absolute zero is 0 K, which corresponds to −273.15°C.
Common Celsius to Kelvin Conversions
| Celsius (°C) | Kelvin (K) |
|---|---|
| −273.15°C | 0 K |
| −100°C | 173.15 K |
| −40°C | 233.15 K |
| 0°C | 273.15 K |
| 10°C | 283.15 K |
| 20°C | 293.15 K |
| 25°C | 298.15 K |
| 30°C | 303.15 K |
| 37°C | 310.15 K |
| 100°C | 373.15 K |
Examples of Celsius to Kelvin Conversion
Example 1: Convert 10°C to Kelvin
10 + 273.15 = 283.15 K
So, 10°C equals 283.15 K.
Example 2: Convert 50°C to Kelvin
50 + 273.15 = 323.15 K
So, 50°C equals 323.15 K.
Example 3: Convert −20°C to Kelvin
−20 + 273.15 = 253.15 K
So, −20°C equals 253.15 K.
Celsius and Kelvin Difference
A change of one degree Celsius is the same size as a change of one kelvin. The difference is in their starting points, not the size of their temperature intervals.
For example, an increase from 20°C to 30°C is a change of 10°C. The equivalent change from 293.15 K to 303.15 K is also 10 K.
Where Is Kelvin Used?
Kelvin is commonly used in scientific calculations involving temperature. It is particularly important in physics, chemistry, thermodynamics, astronomy, and engineering because it provides an absolute temperature scale.
Using Kelvin can also make scientific formulas easier to apply because the scale begins at absolute zero.
Common Mistakes to Avoid
The most common mistake is adding the wrong conversion value. The correct relationship is 1°C = 274.15 K, but the conversion formula is based on the temperature offset: K = °C + 273.15.
Another important point is that Kelvin is written as K, not °K. The degree symbol is not used with Kelvin.
Quick Way to Convert Celsius to Kelvin
For any Celsius temperature, simply add 273.15. For example, 5°C becomes 278.15 K, while 75°C becomes 348.15 K.
For repeated conversions or values with several decimal places, a Celsius to Kelvin calculator can provide a quick result while reducing simple arithmetic errors.
Remember the Formula
The key relationship is:
Kelvin = Celsius + 273.15
Once you know this formula, converting between Celsius and Kelvin is a simple addition. Keep the appropriate decimal places when precision is important, especially in scientific or technical calculations.